Problems with picking combo for a 3 +1 setup.

Heyas folks!

Well the topic says it all. The reason I have this problem is that I use to play 4 shammies on 1 comp pre WotLK but now I've started again and noticed that my comp can't handle 4 accounts on 1 comp so I use my old computer as 2nd for a 3 acc + 1 acc combo.
Obviously this sux for my 4 shammy combo team so I started to fiddle around (no not that you pervs) and started to think that maybe a combo of 3 hunters + shammy or 3 Unholy DK's + Priest would be a decent setup.
I basiclly have 4 shammies pala priest dk mage that are 70 and a 80 druid, these are all mixed up on the accounts. A combo where I could benifit from these higher level chars to boost a new group or something like that helps ofc.

Any recommendations from your experiences? I will most likely be doing mainly PvE but I do want an option to switch over to PvP heavy mode if I feel like it.

A note here is that the 2nd comp will be using a 2nd keyboard which is restricting a lot. And atm I will not be making upgrades on the computers either fyi. ;)

All advise, help, suggestions and hugs are appriciated.

Well as no ideas were brought up I started with 3 x hunters (43rd lvl) + shammy combo but the leveling got too boring so I switched to Pala (prot) + 3 x shammy setup and this is working decently atleast for leveling.

I'm curious though can this combo do instance XP grinding as well? UK etc? My pally is really crappy geared for tanking but with the quest gears atleast he is getting some upgrades, doubt it will be of much use for early instance tanking!?

Ta for any assistance.